Machine



(No Model.)

H. TABOR.

METAL POUNDING MAGHINE.

Patented Oct. 15, 1889.v

' Inventor I No. 413,153.

Attorney Witnesses:

- UNITED STATES HARRIS TABOROF NEW YORK, N. Y.,

TUBING COMPANY,

PATENT OFFICE.

ASSIGNOR TO THE TABOR MANUFAC- OF SAME PLACE.

METAL-FOUNDlNG MACHINE.

SPECIFICATION forming part of Letters Patent No. 413,153, dated October 15 1889.

Application filed October 10, 1888.

To all whom it may concern:

Be it known that I, HARRIS TABOR, of New York, New York county, New York, have invented certain new and useful Improvements in Metal-Founding Machines, of which the following is a specification.

This invention pertains to machines for use by the metal-founder in producing sand molds for castings, and the improvements will be readily understood from the following description, taken in connection with the accompanying drawings, in whioh- Figure 1 is a front elevation of a metalfounding machine illustrating my improvements, many of the usual details of the machine not affected by my present invention being omitted; Fig. 2, a side elevation, upon an enlarged scale, of portions of the same, the right-hand flask and pattern appearing in vertical transverse section; Fig. 3, a side view similar to Fig. 2,illustrating the construction modified in detail; and Fig. 4, a plan of the platen-work of Fig. 3.

In the drawings, and confining present attention entirely to Figs. 1 and 2, A indicates the frame-work of a molding-press with various features not affected by my present invention omitted, the molding-press chosen for illustration beingsuch as is set forth in Patent No. 365,710, dated June 28, 1887, in which the pressing force is produced by a fluid under pressure in a cylinder; B, the pressingcylinder of this molding-machine; O, the piston-rod thereof; D, the platen of the press attached to the lower end of the piston-rod; E, the bed of the press, having the form of a movable table with wheels, so that this bed can be moved under and from under the platen of the press; F, pivots or lugs projecting outwardly centrally from each side of this movable bed; G, the lower hook ends of the vertical strain-rods of the press, these strain-rods being attached at their upper ends to the cylinder, and the lower hook ends being adapted upon rising to engage the lugs F, as in the case of the earlier patent referred to; H, the wheeled axles of the press-bed; J, the face portion of the pattern being operated with, this pattern being secured to the under surface of the platen D, to one side of the center thereof,

Serial No. 287,780. (No model.)

the pattern chosen for illustration being an ordinary stove-door; K, the usual half-flask, in which a portion of the mold is to be produced from the pattern part J; L, the sandbox for this half-flask, forming a downward continuation thereof; M, the sand plunger for the half-flask K, projecting a portion of the way into the sand-box L and adapted under pressure to move through said sand-box to or into the half-flask K, this plunger resting upon that pressing-surface of the molding machine which is opposite to the pressingsurface carrying the pattern-J, the surface carrying the plunger being, in the case illustrated in Figs. 1 and 2, the bed E of the press; N, intermembering dowels upon the pattern part J and half-flask K, to insure the proper presentation of the pattern part to the halfflask O, the back portion of the pattern secured to the platen D of the press alongside, but at some distance from, the pattern part J; P, the half-flask to form that part of the mold for the back portion of the pattern; Q, the sand-box for this half-flask; R, the plunger for this half-flask; S, the intermembering dowels pertaining to this half-flask and its pattern part; T, the loose sand in the halfflask P, ready for the molding operation, and U springs interposed between the bed E and the boxes of its axles. 8o

Assume that a molder working by ordinary hand process had in hand a pattern for a stove-door. The pattern of wood or metal would have a form in all respects corresponding with the form of casting to be produced. 8 5 He would ram this up in a mold formed of two half-flasks, and upon opening the mold and withdrawing the pattern one of thelialfflasks would present a mold-cavity fitting the i front of the door, and the other half-flask would present a mold projection fittingthe back of the pattern, and when the mold was closed there would be a complete mold-cavity corresponding to the entire shape of the pattern.

I provide by my improvements for the production by machine compression of two halfmolds identical with the two half-molds v which would have been, produced by the molder working by hand process, and 1 prolng-machine. The pattern portion J of Fig.

2 will, in the illustrative case chosen, be of such form as to produce, when properly pressed into connection with the sand in the half-flask K, a mold-surface of precisely the form found in the corresponding half-mold produced by the hand molder. The pattern portion J will therefore consist of a facesurface from which project pattern parts corresponding to one face of the hand molders pattern... The pattern portion 0 is to be of a form to'produce, upon proper compression in the sand, a mold-surface corresponding with that produced by the hand molder from the back of the pattern. This pattern portion would therefore consist of a surface having a recess corresponding with the recessed back of the hand molders pattern. The half-flasks K and P will dowel together, as usual, to form a complete mold, and the pattern portions J and O are to properly dowel with their appropriate half-flasks, so that the impression results of the two pattern parts in the sand will properly correspond when the half-flasks are put together. In other words, the dowels of the two pattern parts will intermember with each other, and consequently two halfflasks appropriately fitting these dowels will The half-flasks and sandboXes being in position over their plungers and filled with sand are ready for the compression. The platen D upon descending causes the pattern-dowels to engage with the dowels of the appropriate half-flasks. I The pattern parts begin then to press downwardly upon the top of the half-flasks, and pattern I parts and half-flasks and sand-boxes descend,

as does also the top surface of the sand in the half-flasks. The sand in the half-flasks will be pushed by the plungers out of the sandbox and entirely into the half-flasks and firmly compressed against the pattern parts. Upon ascent of the platen and pattern parts the pattern parts will have left their impression in the half-fiasks,a-nd will have produced two half-molds, which will go together to form a complete mold. If the quantity of sand has been properly regulated, the compression may cease when the tops of the plungers correspond with the bottoms of the half-flasks, and this will leave the half-molds with the sand at their bottoms flush with the bottomedges of the half-flasks. The sandboxes are merely the usual expedients to secure this flush condition of the complete halfmolds, and they may, of course, be entirely omitted, and the plungers may operate directly in the half-flasks, leaving at the completion of the pressing depressions therein correspondi-ngwith the degree to which the sand has been compacted. The plungers may, and for many kinds of work preferably will, be provided with displacement-blocks, as set forth in Patent No. 365,711, of June 28, 1887, for securing a more equable compres sion of the sand over various portions of the mold-surface; or, if desired, this equable compression may be secured by construct ing the plungers as set forth in Patent No. 347,447, of August 17, 1888. The loose sand in one of the sand-boxes may be greater in quantity or more compact than in the other, and thus be liable to result in a denser halfmold. I provide for equalizing the pressures upon the two half-molds.

In Patent No. 365,710, ofJune 28,1887, will be found a general description of the molding-press which has been chosen for illustration in Fig.1 of the present drawings. The action of the fluid in the cylinder B forces the platen D downwardly, and when that platen meets with sufficient resistance the cylinder B rises and pulls upwardly upon its attached strain-bars, thus drawing the hooks G against the lugs F on the body of the press, after which the compression continues to completion, the frame of the press and the axles of the bed not being called upon to meet the pressing strain. In the present case I form the lugs F as pivots on which the bed E may rock to a limited extent when the hooks of the strain-bars engage below them. These pivot-lugs are located in the vertical plane of the space between the two pattern parts. By this means, when the press is under strain, the two half-flasks are supported upon opposite ends of a pivot-lever by the bed E, and the pressing strains will be equalized on the two half-molds. The springs U are of sufficient strength to support the bed E at a normal level, and weak enough to permit the proper tilting of the bed upon its central pivots. They have nothing to do with the degree of force of compression employed in pressing the sand.

The object in making the bed of the press in the form of a wheeled car is to facilitate the work by permitting the flask to be handled and filled and removed, &c., while the bed of the press is away from under the platen. Such provision, of course, is not absolutely essential, nor are the springs U essential. The hooks G, instead of having vertical movement, as in the earlier patent referred to, may be rigid supports for the pivot-hooks F of the bed, capable of supporting the bed under the pressing strains and of permitting the tilting of the bed under unequal strains.

In Figs. 1 and 2 I have illustrated the plungers and the pivot-lever which supports them as operating below the half-flasks. This particular arrangement of the parts is not essential, as will be at once apparent if Fig. 2 be viewed when turned upside down, which will cause the plungers and their pivot-lever to become the top pressing element of the press.

In Figs. 3 and 4, however, I illustrate a construction with the pressing elements thus reversed, the bed E in this case being rigid and carrying the pattern parts and flasks. The pivot-lever in this case comes above and carries the top pressing elements of the press.

In these views, W indicates the pivot-lever centrally pivoted to the piston-rod at X, and V indicates the two plungers at the opposite ends of the lever. The result is as indicated in connection with Fig. 2.

I claim as my invention- 1. In metal-founding apparatus, the combination, substantially as set forth, with a press arranged to force two horizontal opposing press-surfaces toward each other, of a' face pattern part upon one of said press-surfaces and provided with dowels, a back pattern part alongside of but away from said face pattern part and upon the same presssurface of the press and provided with dowel elements of interlnembering correspondence with the dowel elements of said face pattern portion, and a horizontal axis of oscillation for the support of one of said press-surfaces arranged in the vertical plane of the space between the said two pattern parts.

2. In a metal-founding machine, the combination, substantially as set forth, with a press arranged to force two opposing pressing-surfaces toward each other, of one such pressing-surface arrangedat right angles to the path of pressing motion, an opposite pressing-surface disposed normally parallel to said first-mentioned pressing-surface, a central horizontal pivot of oscillation centrally supporting said second surface, and springs supporting said surface at each side of said pivot.

HARRIS TA'BOR. 

